I think all the points have been made about the older Browning HPs. I own two from 1976 and I only shoot 115 grain FMJs through them…. Some 124 grain stuff too. If needed, in a pinch, I’m sure they can handle a few mags of +P or even +P+ without issues.
Honestly, I have several 9mm pistols from 1970s and well into the late 1980s and with them, I tend to only shoot plain Jane 115 grain FMJs. My Older S&W Models 39-2 and 59s, I wouldn’t trust them with a steady diet of +P ammo due to their alloy frames, but S&W’s Model 639 and 659, that’s a different story since they’re build like tanks.
Original Brownings are too much of a classic to beat up with hot ammo since IMHO, they’re more like fine artwork than a work horse plowing the fields. Leave all that hard labor to modern 9mms!!